The Scenario

Each party begins by selecting a new Bitcoin address, and then sharing
it with the others. These addresses - three in total - are combined to
create a three-pronged Bitcoin address. This three-pronged address will
require the consent of two of {Archey, Bertha, Iceland} in order for
either Archey or Bertha to withdraw funds from it as per the terms of
their agreement. This address will visually differ from normal Bitcoin
addresses - it will begin with the number '3' unless testnet is used,
in which case it will begin with the number '2'.

The purpose of this document is to demonstrate the Electrum CLI's
effectiveness in facilitating safer Bitcoin transactions with multisig.

Steps

We're assuming Archey and Bertha have already agreed to the Twitter
Platinum invite's terms of sale. By following these instructions, they
will both greatly mitigate counterparty risk for little to no cost.

On Bertha:

Normally, Bertha would wait until the payment into the escrow had several
confirmations, then she'd give Archey the Twitter Platinum invite. If
she trusts Archey, she may deliver the invite the moment Bitcoin funds
enter the pending stage.

Step 3: Withdraw from the Multisig Address

Now we assume the deal is complete to everyone's satisfaction and Bertha
wants to take the coins out of escrow.

On Bertha:

Bertha drafts a transaction withdrawing the BTC from the multisig address
into an address of her choice.

[bertha@bertha ~]$ electrum -w bertha.dat deseed -o
Warning: you are going to create a seedless wallet'It will be saved in 'bertha.dat.seedless'Are you sure you want to continue? (y/n) yDone.